fig5

Figure 5. (A) Response values of the G-T@M/C sensor to different gases at the same concentration (1 ppm); (B) Response-recovery curve of the G-T@M/C sensor at different NH₃ concentrations; (C) Resistance response curve of the G-T@M/C sensor at different NH₃ concentrations; (D) Response-recovery curves of the G-M/C sensor (upper) and G-T@M/C (lower) sensor at 1 ppm NH₃ concentration; (E) Schematic diagram of the gas response mechanism of the G-T@M/C sensor; (F) UPS spectra of MXene and TiO₂@MXene; (G) The alignment of MXene energy levels before and after oxidation demonstrates the formation of a TiO₂@MXene Schottky barrier; (H) Schematic illustration of charge transfer and band bending mechanisms when G-T@M/C aerogel comes into contact with ammonia gas. UPS: Ultraviolet photoelectron spectroscopy.